The Python Console

Save Subscribe
Before writing a Python program to allow us to set the servo to an angle between 0 and 180, we can try some experiments in the Python Console.

To launch the Python Console type:
Download File
Copy Code 
# python
Python 2.7.3 (default, Apr  3 2013, 21:37:23) 
[GCC 4.7.3 20130205 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
First, we need to import the library, so enter the command:
Download File
Copy Code 
>>> import Adafruit_BBIO.PWM as PWM
Now enter the commands below into the Python Console one at a time, and you should see the servo change position.
Download File
Copy Code 
>>> PWM.start("P8_13", 95.0, 60)
>>> PWM.set_duty_cycle("P8_13", 97.0)
>>> PWM.stop("P8_13")
>>> PWM.cleanup()
NOTE: If your servo doesn't move you might need to change the polarity of the PWM signal and try again. Add a 4th parameter to the PWM.start function with a value of 1 (one), this will invert the PWM signal so it's low when normally high and vice versa.

Here's the same code but with the inverse parameter set:
Download File
Copy Code 
>>> PWM.start("P8_13", 95.0, 60, 1)
>>> PWM.set_duty_cycle("P8_13", 97.0)
>>> PWM.stop("P8_13")
>>> PWM.cleanup()
 Wiring Writing a Program 

This guide was first published on Jul 15, 2013. It was last updated on Jul 15, 2013.

This page (The Python Console) was last updated on Jul 15, 2013.

Text editor powered by tinymce.